Synchronous motor



June 1936- A. H. NEUREUTIHER 2,

SYNCHRONOUS MOTOR Filed April 16, 1952 2 Sheets-Sheet l FIG. 2

FIG.

INVENTO June 1936. A. H. NEUREUTHE-R 2,046,130

SYNCHRONOUS MOTOR Filed April 16, 1952 2 Sheets-Sheet 2 l3 I3 I 8 9 I 6 7 c 2! 7 2 [Z X \1 Tv I2 FIE/7 7g 3 I I8 5 ,2 9

FIGS

- INVENTR. I I! iatented June 30, 1936 SYNCHRONOUS MOTOR Andrew H. Neureuther, Peru, 11]., assignor to' Western Clock Company, Peru, 111., a corporation of Illinois Application April 16, 1932, Serial No. 605,634

7 Claims.

My invention relates to synchronous motors and has for its object the production of a small synchronous motor driven by the alternating current from commercial lighting and power systems that can be used to drive clock hands or other time indicating means especially when said commercial systems are operated at a regulated frequency of 60 cycles per second or other standard frequency.

A further object of my invention is to produce 19 an extremely simple and inexpensive motor that will immediately come into step with the alternations of the magnetic field when launched at either above or below approximately synchronous speed manually or automatically by any of the usual means and which will remain in step as long as the current flows regardless of the usual electrical load and surge disturbances on such commercial lighting and power lines. And it is readily started and held in synchronism without the 20 usual mechanical movement or inertia means generally employed previous to my invention.

A further object of my invention is to produce a rotor as well as a stator lamination that has the polar projections thereon twisted at an angle 25 to the plane of the lamination of thestator, such twisted polar projections being readily and easily formed up on the rotor and the stator lamination by means of punch press tools and operations and thus are especially suited for inexpensive mass 30 production operations.

I accomplish these objects by the means shown in the accompanying drawings in which:

Fig. 1 is a front view showing my motor. Fig. 2 is a top cross-sectional view along a line 35 2-2 of Figure 1.

Fig. 3 is a cross-sectional view similar to Figure 2 showing the rotor held in a different position in relation to the field poles.

Fig. 4 is a cross-sectional view similar to Figure 40 2 showing the stator laminations with centrally disposed angular polar projections associated with a rotor having the usual polar projections.

Fig. 5 shows a cross-sectional view similar to Figure 2 showing a modification of my motor in 45 which both the rotor and the stator laminatlons have the twisted polar projections.

Fig. 6 shows a cross-sectional view similar to Figure 2 showing a modification ofmy motor in which the rotor and only one of the stator lami- 50 nations have the twisted polar projections.

Fig. '1 shows a perspective view of a stator lamination having the twisted polar projections on same.

Fig. 8 is an enlarged perspective view of the 55 rotor showing the twisted polar projections which polar projections are angularly and substantially centrally disposed to the plane of the disc.

Similar numerals represent the same parts throughout the several views.

In the drawings I represents the frame of the 5 usual clock movement the remainder of which is not shown. Adjacent to this plate I and fastened thereto, as shown, are the frames 2 of the motor 3 which have the magnet core 4 fastened across and connecting the lower ends thereof, on which 10 core is mounted the magnet winding 5 as shown, which in operation is connected across the usual commercial alternating current line that has a regulated frequency of 60 cycles per second. The

frames 2 and the core I are made of magnetic l5 material, the frames 2 having the pole pieces 6 and I each of which have a plurality of polar projectionsor teeth 8 and 9. Bearing frames I0 and II are fastened to the frames 2 and plate I by means of the pillars I2 and the nuts I3 shown, which also serve to hold the remainder of the usual clock movement in position. In these bearing frames I0 and II are mounted the bearings I4 and I5 respectively in which is journaled the shaft I6 on which is mounted a rotor I1. The rotor II comprises a disk which has a plurality of polar projections or teeth I8 which are formed out of the periphery of the disk preferably angularly and substantially centrally disposedto the surface of said disk as shown in the rotors in Figures 1 and 2. Mounted on one .end of the shaft I6 is the knurled starting member I9 and on the other end of said shaft is mounted the pinion 20.

The rotor I1 is kept positioned well within the influence of the magnetic field of the poles Ii and 1 by means of the collars 2| mounted on the shaft I6 adjacent to the bearings I4 and I5 and the rotor may be positioned in the position shown in Figure 2 when the magnet coil 5 is energized by means of the usual alternating current and in 40 the position shown in Figure 3 when the magnet is not thus energized and resilient means may be employed to retain it in said position during the period when said magnet coil 5 is not energized.

In the modification shown in Figure 4 the polar projections 8 and 9 are formed out of the edge of the pole pieces 6 and 1 respectively and are angularly and substantially centrally disposed to the surfaces thereof similarly as the polar projections are formed on the rotor itself as shown in Figs. 1

and 2. 1

In the modification shown in Figure 6 the polar projections 8 on one of the pole pieces 6 are formed similarly to those described in Figure 5 while the polar projections, 9 remain in the same plane with the pole piece l, While the rotor has the angularly and substantially centrally disposed polar projeo= tions shown in Figure 5.

In operation the usual ends of the coil it (which ends are not shown) are connected across the alternating current lighting line. Then the knurled member 09 is taken between the thumb and fingers to spin in the desired direction. Then as above stated the polar projections It when the rotor is left spinning as a freely mounted body and approximates synchronous speed will immediately come into step with the alternating magnetic field produced by the alternating cur== rent and will remain in synchronism as long as said current flows.

It will be understood, of course, that While I have here shown several forms of my invention, I do not wish to limit myself to the exact con-= structions shown but desire to have these taken in a sense illustrative of any and all the forms of same as will come fairly within the scope of the appended claims.

I claim:

'1. A rotor element for a synchronous motor comprising a shaft, a one-piece disc of magnetic material secured to said shaft, said disc having twisted spaced polar projections forming exten= sions of the body of the disc and having the peripheral edges thereof arranged in planes dis= placed from the plane of the body of the disc.

2. A rotor element for a synchronous motor comprising a shaft, a one-piece disc of magnetic material secured to said shaft, said disc having twisted spaced polar projections forming extensions of the body of the disc and having the peripheral edges thereof arranged in planes displaced at an angle of substantially 45 degrees from the plane of the body of the disc.

3. A stator element for a synchronous motor comprising a lamination of magnetic material having a plurality of twisted spaced arcuate polar projections forming extensions of the body of the lamination and having the peripheral edges thereof arranged in planes displaced from the plane of the body of the lamination.

A stator element for a synchronous motor comprising a lamination of magnetic material having a plurality of twisted spaced arcuate polar projections forming extensions of the body of the lamination and having the peripheral edges there-= of arranged in planes displaced at an angle of substantially aii degrees from the plane of the body of the lamination.

5. In a synchronous motor, a stator comprising field poles, a' plurality of projections on said field poles, means for producing an alternating magnetic field in said projections, in combination with a shaft, a one-piece disc of magnetic material secured to said shaft, said disc having twisted spaced polar projections forming exten sions of the body of the disc and having the peripheral edges thereof arranged in planes displaced from the plane of the bodyof the disc and means for manually starting said rotor.

6. In a synchronous motor, a stator element comprising a lamination of magnetic material having a plurality of twisted arcuate polar projections forming extensions of the body of the lamination and having the peripheral edges thereof arranged in planes displaced from the plane of the body of the lamination, means forproducing an alternating magnetic field in said projections, a shaft, a rotor mounted on said shaft comprising a single disc of magnetic material having a plurality of projections cooperating with the polar projections on said stator and means for manually starting said rotor.

7. In a synchronous motor, a stator having elements comprising a lamination. of magnetic material having a plurality of twisted arcuate polar projections forming extensions of the body of the lamination and having the peripheral edges thereof arranged in planes displaced from the plane of the body of the lamination, means for producing an alternating magnetic field in said projections, a shaft, a one-piece disc of magnetic material secured to said shaft, said disc having twisted spaced polar projections forming extensions of the body of the disc and having the peripheral edges thereof arranged in planes displaced from the plane of the body of the disc and means for manually starting said rotor.

ANDREW H. NEUREUTHER. 

